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As of 2010, never.
The first season of the Seattle Mariners was 1977.
Go to the Mariners' web site for the teams roster...try MLB.com and click on Seattle Mariners.
Dan Cortes debuted on September 24, 2010, playing for the Seattle Mariners at Safeco Field; he played his final game on September 12, 2011, playing for the Seattle Mariners at Safeco Field.
Brian Sweeney debuted on August 16, 2003, playing for the Seattle Mariners at Safeco Field; he played his final game on October 1, 2010, playing for the Seattle Mariners at Safeco Field.